參數(shù)資料
型號(hào): 03H4969
元件分類: 通信及網(wǎng)絡(luò)
英文描述: SPECIALTY TELECOM CIRCUIT, PQFP100
封裝: 14 X 20 MM, 2.70 MM HEIGHT, 0.65 MM PITCH, PLASTIC, FP-100
文件頁數(shù): 18/48頁
文件大?。?/td> 464K
代理商: 03H4969
Product Part Number: IBM22-ALDC1005S
ALDC1-5S
I B M Microelectronics
Document Number: DCALD5DSU-04
Data Compression
Figure
4-8. Four-edge Handshaking. Although
other timings are allowed, a four-edge
handshaking protocol will simplify
timing of the original data interface. As
shown, the falling edge of -OREQ causes
-OACK to become active. When the
falling edge of -OACK is detected, the
user can let -OREQ become inactive.
The rising -OREQ will in turn cause -OACK
to become inactive, and complete the
data transfer.
4.3 Compressed Data Interface
The compressed data interface works on an
asynchronous burst mode direct memory
access handshaking protocol. A sixteen byte
FIFO buffer is an intrinsic part of the com-
pressed data interface.
The compressed data interface is shown in
Figure 4-9. The timing details for a transfer
into the compressed data interface are shown
in Figure 4-10. The timing details for a transfer
out of the compressed data interface are shown
in Figure 4-11 on page 4-9.
-CREQ (output)
Compressed
-CACK (input)
Data
Interface
.
+CDATA7-
.
+CDATA0 (bidirectional)
.
Figure
4-9. Compressed Data Interface
___
__________
\
/
\
-CREQ (output)
\_________________________________/
\___
T1
T2
T3
T4
T5
________
____
_____________________
\/\/\/
-CACK (input)
\__/
T6
T7
_______
__________/DataVal\_/DataVal\_/DataVal\________________+CDATA7-
\_______/ \_______/ \_______/
+CDATA0 (bidi. in)
Figure
4-10 (Part 1 of 2). Data Transfer into Compressed Data Interface (Decompression)
(C) IBM CORP. 1993, 1994. ALL RIGHTS RESERVED. USE IS FURTHER SUBJECT TO THE PROVISIONS ON THE BACK OF THE TITLE PAGE.
4-7
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